9toFast vs Fastly
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
9toFast
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9toFast is a clean and intuitive intermittent fasting app designed to help you stay consistent without pressure. Whether you’re fasting for better focus, energy, or health, 9toFast makes it easy to track your progress and feel in control. Stay on track effortlessly • Smart fasting timer: Start, pause, or end your fasts anytime and watch your fasting ring fill in real-time. • Custom fasting plans: Choose from popular plans like 16:8 or 18:6, or set your own window. • Progress dashboard: Visualise your streaks and completion rates at a glance. • Personalised themes: Match your app to your mood with sleek light and dark options. • Simple insights: See how your fasting habits evolve over time with easy-to-read stats. Why users love 9toFast • Minimal design that keeps fasting simple • No clutter, ads, or confusing features • Built for balance, not restriction Perfect for beginners and pros Whether you’re new to fasting or have been doing it for years, 9toFast adapts to your lifestyle. Track your fasts, stay consistent, and celebrate small wins daily. Coming soon • Weight tracking • Calorie Counting • Meal Logging • Health app integrations • Fasting challenges • Custom reminders and streak rewards Start your fasting journey today with 9toFast: the fasting tracker that’s simple, motivating, and built for real life.
Fastly
This app helps you track intermittent fasting with a clean interface, customizable plans, and motivational features. Monitor your body's response through different fasting zones and visualize progress with charts and widgets. Your data remains private, stored locally or optionally via iCloud.
- Customizable fasting plans (16:8, OMAD, etc.)
- Real-time circular timer and zone tracking
- Motivational streaks, badges, and calendar heatmap
- Weight tracking with trend visualization
- Home screen widgets and Live Activities
- Optional iCloud sync and CSV export
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Intermittent fasting, without the clutter. Fastly is a clean, private fasting timer built for people who want to stick to 16:8, OMAD, or any plan they choose — with beautiful widgets, real-time zone tracking, and zero ads or accounts. Start a fast in one tap. Watch your body move through five fasting zones — from catabolism to deep autophagy. Build streaks, earn badges, and see your progress in charts that actually make sense. FASTING, YOUR WAY • Pick from 16:8, 18:6, 20:4, OMAD, 5:2, or build a custom plan • Live circular timer with elapsed, remaining, and target • Edit past fasts or log a forgotten one manually • End a fast by voice with the Siri shortcut SEE YOUR BODY'S RESPONSE • Five fasting zones: Anabolic, Catabolic, Fat Burning, Ketosis, Autophagy • Clear guide explains what's happening at each stage • Gentle notifications when you enter a new zone STAY MOTIVATED • Streaks and weekly summaries • 20 unlockable badges for consistency and milestones • Calendar heatmap shows every fast at a glance • Full history with notes on each session TRACK YOUR WEIGHT • Log in kg or lbs in one tap • Visualize trends over weeks, months, or years • Combined timeline of fasts and weight changes WIDGETS + LIVE ACTIVITIES • Home Screen widgets in Small, Medium, and Lock Screen sizes • Live Activity keeps your fast visible on the Lock Screen and Dynamic Island • Real-time countdown and zone status — no need to open the app YOUR DATA STAYS YOURS • Optional iCloud sync across iPhone and iPad • No account, no ads, no tracking • CSV export anytime (Pro) FASTLY PRO Unlock the full experience: • Unlimited history (free tier shows last 30 days) • Widgets • Trend, Eating Window, Fasting Pattern, and Weight charts • 30-day and yearly insights • CSV export of all your data PRIVACY FIRST Your data lives on your device (and optionally your private iCloud). We don't collect, sell, or share anything. Ever.
Screenshots
Verdict
The clearest difference is in-app purchases: Fastly at none against 9toFast's 3. Fastly also leads on ads (none vs shown). 9toFast's advantage is iOS requirement (15.1 vs 17.0). On price, update cadence and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. 9toFast sells 3 in-app purchases, starting at $0.99 per month. Fastly asks for nothing beyond the download.
9toFast ships an update fortnightly, Fastly every 9 days. The most recent releases landed on October 15, 2026 and October 13, 2026 respectively.
| Parameter | 9toFast | Fastly |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Update frequency | Fortnightly | Every 9 days — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | — | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.1 — better | 17.0 |
| Further details — not scored | ||
| Size | 47 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | Esther Yekini | Tejas Patel |
In-app purchases
9toFast
- Premium Monthly$0.991 Month
- Premium Yearly$9.991 Year
- Premium Lifetime$19.99
Fastly
No in-app purchases









